Pendellösung Interferometry Probes the Neutron Charge Radius, Lattice Dynamics, and Fifth Forces

Abstract

Structure factors describe how incident radiation is scattered from materials such as silicon and germanium and characterize the physical interaction between the material and scattered particles. We use neutron pendellösung interferometry to make precision measurements of the (220) and (400) neutron-silicon structure factors, and achieve a factor of four improvement in the (111) structure factor uncertainty. These data provide measurements of the silicon Debye-Waller factor at room temperature and the mean square neutron charge radius $⟨r_n^2⟩=-0.1101\pm 0.0089{\mathrm{fm}}^2$. Combined with existing measurements of the Debye-Waller factor and charge radius, the measured structure factors also improve constraints on the strength of a Yukawa-modification to gravity by an order of magnitude over the 20 pm to 10 nm length scale range.

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• Particle Physics at the European Spallation Source
• Pendellösung Interferometry Probes the Neutron Charge Radius, Lattice Dynamics, and Fifth Forces
• Primordial black holes as a dark matter candidate in theories with supersymmetry and inflation
• Leading bounds on micro- to picometer fifth forces from neutron star cooling
• Stellar cooling limits on light scalar boson revisited
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• Searching for New Fundamental Interactions via Isotopic Shifts in Molecular Lattice Clocks
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• Accurate Determination of Blackbody Radiation Shifts in a Strontium Molecular Lattice Clock
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• Generalizing the Quantum Information Model for Dynamic Diffraction
• Measurement of Neutron Whispering Gallery States Using a Pulsed Neutron Beam
• The dual King relation
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• Constraining Yukawa-type interaction and coupling constant of axionlike particles to nucleons from recent measurement of the Casimir-Polder interaction
• Searching for exotic scalars at fusion reactors